Design and FE analysis of a double rotor synchronous PM machine

The paper presents a new successful design of a double rotor permanent magnet synchronous machine, where special attention was paid to the outer and inner rotor construction. The machine´s structure enables its use in hybrid electric vehicles as a four-quadrant drive system as well as in pure electric vehicles as a single traction motor/generator. Thus, high torque density and low torque ripple values are its main advantages. Finite element analyzes and the power balance method were employed in the machine performance evaluation.